ARM: sti: Provide DT nodes for SBC SSC[0..2]

The Synchronous Serial Controller is used to provide SPI.

These are the ports which are located on the Stand-By Controller (SBC).
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>

arch/arm/boot/dts/stih407-family.dtsi

@@ -390,5 +390,36 @@ spi@9844000 {
 
 			status = "disabled";
 		};
+
+		/* SBC SSC */
+		spi@9540000 {
+			compatible = "st,comms-ssc4-spi";
+			reg = <0x9540000 0x110>;
+			interrupts = <GIC_SPI 135 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clk_sysin>;
+			clock-names = "ssc";
+
+			status = "disabled";
+		};
+
+		spi@9541000 {
+			compatible = "st,comms-ssc4-spi";
+			reg = <0x9541000 0x110>;
+			interrupts = <GIC_SPI 136 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clk_sysin>;
+			clock-names = "ssc";
+
+			status = "disabled";
+		};
+
+		spi@9542000 {
+			compatible = "st,comms-ssc4-spi";
+			reg = <0x9542000 0x110>;
+			interrupts = <GIC_SPI 137 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clk_sysin>;
+			clock-names = "ssc";
+
+			status = "disabled";
+		};
 	};
 };